Calculating machine



Oct. 3, 1944. J MQQDY 2,359,661

CALCULATING MACHINE Filed Aug. 24, l9 42 F'IE 4 doyT 'oaa y I ATTORN EYPatented Oct. 3, 194 4: V

v UNITED 'STATES PATENT. OFFICE I I v Q clwntzfiffi um I John 14 Moody.Oakland. Calii'.'. assignor to Friden Calculating Machine Co.,Inc., acorporation of California I a. Application Augusta, 1942 ,'Serial No.455,849

Claims. (crass-131) 1 This invention relates to calculating machines andis concernedmore particularly with the pro- It is an object of theinvention to. provideimproved centralizing and overthrow preventinglating machine.

- Another object of the invention is to provide a mechanism of theabovecharacter in which the centralizingmeans provides an effectivecentralsimplified construction to .provide an effective quiet actionemploying lighter springs than commonly-used for the same purpose- Otherobjects and advantageswill be apparent from the following'description.of: a, preferred embodiment thereof, as illustrated in the'accompanying drawing, in which:-

Figure 1 is asectional elevationalview of a part of a register of acalculating machinetaken in the plane indicated by the line in Figure 2.

Figure 2 is a transverse sectional view through the register carriage ofa calculating machine, the view being taken as indicated by the line2--2 in Figure 1.

Figure 3 is a sectional elevational view of the elements of thecentralizing and overthrow preventing means of the invention.

Figure 4 is a view similar to Figure 3 but showing the parts as thedial'is being moved clockwise from one position to another.

Figure' 5 is a view similar to Figure 4, but showing the dial turnedslightly further toward the second position.

The invention is illustrated as embodied in the type of calculatimmachine shown in the patent to Carl M. Friden, No. 2,229,889, datedJanuary 28, 1941. Referring to Figures 1 and 2 the machine includes aregister frame indicated generally at In which may be made up of opposedhalves II and I2 formed of sheet metal and having auxiliary angle framemembers l3 and I4 suitably secured thereon. Halves II and I2 of thecarriage frame may be suitably secured together to embrace and providebearings for numeral wheel or dial shafts IS on which the dials 11 areprovided. Intermediate its end each dial shaft I6 is provided with aresetting gear l8 while at its lower end it is provided with a ten-toothgear I! vision of improved centralizing and overthrow'preventingmeansfor the register wheels or dials thereof.

a means for the register wheels or dials of a calcu for receivingincrements of movement in causing registration on the dial. These partsare of the construction shown in said patent.

For purposes of causing centralizing of the dial in any value displayingposition as well as we venting overthrow beyond such position, means areprovided of special double pawl construction which minimizes resistanceto movement ofthe dial while providing a strong centralizing andanti-overthrow action. This'means for controlling the, positioning ofthe dial preferably includes a star-wheel 2| (Figures 1 to 3) having tenequally v spaced-apart depressions corresponding in alignment toithe'tenequally spaced-apart figures on the dial l1 and the ten-teeth of gearl9.

, A pair of centralizing and overthrow preventing pawls are provided tocooperate with'each starwheel 2| including a main pawl 22 and anauxiliary pawl 23. Pawl 22 has an'opening 24 for journalling aboutbearing 26 for an adjacent dial shaft l6 immediately below thestar-wheel 2| of such dial shaft. The right-hand pawl 22 (Figare 1) isjournalled about a bearing 26 having a sions of star-wheel 2|.

dummy shaft 28 therein. Auxiliary pawl 23 is pivoted to main pawl 22 bystud 29 and is connected to pawl 22 by means of spring 30. Both pawls 22and 23 have their ends formed triangular to seat in the complementaldepressions, of the star-wheel 2|. Pawls 22 and 23 are dimensioned toengage in opposite depres- The operation of the mechanism will bedescribed assuming a one-step clockwise movement of dial shaft |6 andstarwheel 2| from the Figure 3 position. As the starwheel 2| starts toturn from the position shown in Figure 3 to that shown in Figure 4, bothpawls 22 and 23 resist such movement and are cammed outwardly. Therocking of the pawl 22 in a counterclockwise direction as viewed inFigure 4, translates the pawl 23 to the left at the same time that it isalso rocked outwardly by the star-wheel 2|. As a result before the starwheel 2| completes half of its movement, the pawl 23 reaches themid-point of the adjacent triangular depressions as shown in Figure 4and will start to descend a face of a recess as shown in Figure 5 beforethe point of pawl 22 reaches its cooperating midpoint. In the oppositedirection of movement pawl 22 passes over the'adjacent high point of thestar-wheel before pawl 23. In each instance, the pawl which just passesover a high point tends to cam the dial ahead and counter-acts in partthe dragging action of the second pawl.

With the type of double pawl action provided herein it is impossible forthe dial to stop out oiposition; because when the nose of one pawl isengaging a'high point of the star wheel, the other pawl exerts a cammingaction urging the star wheel to properly centered position, in otherwords the points of the pawls 22 and 23 never simultaneously engagepoints of the star wheel 2|. This is effected by mounting the pawl 23eccentrically on the pawl 22. Also the agitating action of the pawl 23as long as the star wheel is turning tends to prevent the star wheelfrom coming to rest out of a position where both pawls are seated indepressions of the wheel.

I claim:

1. In a calculating machine, a register dial rotatable to a plurality ofvalue-displayin positions, a centralizing element mounted for rotationwith said dial, having a series of centralizing depressions andcentralizing means for engaging said depression including a pivotedcentralizing pawl spring-urged to engage said element, and a secondcentralizing pawl, pivoted on said first-named pawl and spring-urged toengage said element in opposed relation to said first named pawl.

2. In a calculating machine, a register dial rotatable to a plurality ofvalue-displaying positions, a centralizing element mounted for rotationwith said dial and having a series of centralizing means for engagingsaid element including a pivotally mounted centralizing pawl and asecond centralizin pawl pivoted on said first-named pawl, and springmeans connected between said pawls to cause them to engage oppositedepressions in said element.

3. In a calculating machine, a register dial rotatable to. a pluralityof value displaying positions, a centralizing element mounted forrotation, with said dial having a series of centralizing 7 depressions,centralizing members springurged to engage said element in oppositedepressions thereof, means to provide a support for the first of saidmembers to permit oscillation of said member about an axis parallel tothe axis of rotation of said centralizing element, a pivotal sup port onsaid first member for the second member to permit oscillation of thesecond member about an axis parallel to the axis of rotation of saidcentralizing element, said pivotal support 01' the second member beingdisposed eccentrically of the axis of rotation of the first member sothat oscillation of the first member causes shifting of the pivotal axisof the second member.

,4. In a calculating machine, a register dial rofirst of said members topermit oscillation of said member about an axis parallel to the axis ofrotation of said centralizing element, a pivotal support on said firstmember for the second member to permit oscillation of the second memberabout an axis parallel to the axi of rotation of said centralizingelement, said pivotal support of the second member being disposedeccentrically of the axis of rotation of the first member so thatoscillation of the first member causes shifting of the pivotal axis orthe second member toward said centralizing \element.

5. In a calculating machine, a register dial rotatable to a plurality ofvalue displaying positions, a centralizing element mounted for rotationwith said dial having a series of centralizing depressions, centralizingmembers springurged to engage said element in opposite depressionsthereof, means to provide a. support for the first of said members topermit oscillation of said member about an axis parallel to the axis ofrotation of said centralizing element, a pivotal support for the secondmember to permit oscillation of the second member about an axis parallelto the axis of rotation of said centralizing element, and means toconnect said first member to said pivotal support of said second memberso that oscillation of the first member causes a change in position ofthe pivotal axis of the second memher.

6. In a calculating machine, a register dial rotatable to a plurality ofvalue displaying positions, a star wheel having ten points thereon andmounted for rotation with said dial, a pair of centralizing pawlsspring-urged into engagement with said star wheel and each having aV-shaped portion for engaging diametrically opposite depressionsintermediate th points Of said star wheel when said star wheel has beencentralized by said pawls in a value displaying position, and means toconnect the second pawl to the first pawl so that oscillation of thefirst pawl causes displacement of the second pawl whereby the V- shapedportion's of said pawls are unable to simultaneously engage points orsaid star wheel JOHN L. MOODY.

